The Alfa Romeo Junior Z was a limited production two-seater coupé with aerodynamic bodywork by Zagato of Milan. The kamm tail wedge-shaped body was designed by Ercole Spada at Zagato. The Junior Z was introduced at the 51st Turin Motor Show of November 1969. Unlike Zagato’s earlier, race-oriented and aluminium-bodied Giulietta SZ which had a very active competition history, the Junior Z was not specifically intended for racing and did not see much use in competition. The Junior Z was bodied had a steel bodyshell with an aluminium bonnet and, on the earlier Junior Z, aluminium doorskins. The car was based on the floorpan, driveline and suspension of the Alfa Romeo Spider 1300 Junior. However the floorpan was shortened behind the rear wheels to fit the short rear overhang of the Zagato bodywork. The engine was the same 1,290 cc twin cam with two twin-choke carburettors of the GT 1300 Junior and Spider 1300 Junior. It produced 89 PS DIN (65 kW; 88 hp) or 103 PS SAE at 6,000 rpm, giving the car a top speed of 175 kilometres per hour (109 mph). In the cabin driver and passenger were seated in highly bolstered bucket seats with incorporated headrests. Two large round instruments, tachometer and speedometer, faced the driver; three more auxiliary gauges were in the middle of the Zagato-designed dashboard. The steering wheel was the same two-spoke, plastic rimmed one of the other Junior models. In total 1,117 examples were built, of which 2 were destroyed during production because the bodyshells were not within specification. Production of the Junior Z continued through 1972, and was replaced by the 1.6-litre 1600 Junior Z at the end of the year; although according to the records two more 1.3-litre cars were completed in 1972.
The 1600 Junior Z was launched at the 54th Turin Motor Show in November 1972. In this case the car was based on the unaltered floorpan of the 1600 Spider, so that the standard sized fuel tank could be left in place. As a consequence, at 4 metres long the 1600 Junior Z measured 100 mm (3.9 in) more than the 1300. This can be seen at the back were the sloping roofline runs further back and the back panel is different and lower. The lower part of the rear bumper features a bulge to make room for the spare tire. The 1,570 cc engine with two twin-choke carburettors had an output 109 PS DIN (80 kW; 108 hp) or 125 PS SAE at 6,000 rpm. Top speed rose to 190 kilometres per hour (118 mph). Besides the longer tail, a number of exterior details distinguished the 1600 Junior Z from the previous model: the arched front bumper was bulkier, the fuel filler was moved to the left hand side, the tail lights were larger items sourced from the 2000 Berlina, the door handles had black plastic housings, and the exhaust pipe was down turned. Badging on the tail now read “1600 Z” instead of “Junior Z”. Inside the steering wheel was now a wood rimmed one, with horn buttons through the three metal spokes. In total 402 examples of the 1600 were made, the last one being produced in 1973; the cars were then sold until 1975.